My understanding is that hunger is only partially influenced by blood sugar
per se and that hormones such as leptin and ghrelin also play a role in the
hunger response.

Other than breaking muscle tissue down, converting it to the sugar glucose
(via deamination and gluconeogenesis) and using that sugar to maintain
glycogen levels, I am not sure that there is a way to maintain glycogen levels.

Even if this were possible (I'm not sure that it is) using a supplement or
a drug, loss of muscle tissue would not be considered a positive outcome.

Since I believe that you are really asking how to stave off hunger and
prevent weight gain, I would say that the best strategies would be:

1) to eat regularly (at least 3 times per day);
2) to consume a serving of protein at each meal (protein seems to be the
most satiating of the macronutrients);
3) to consume a variety of low-glycemic index starches, fruits, and
vegetables in order to help maintain blood sugar levels; and
4) to exercise regularly (using a combination of resistance and aerobic
exercise) in order to increase metabolic rate.